Faculty Publications

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Studies on influence of injection timing and diesel replacement on LPG-diesel dual-fuel engine
(2003) Sudhir, C.V.; Desai, V.; Suresh Kumar, Y.; Mohanan, P.
Reducing the emissions and fuel consumption for IC engines are no longer the future goals; instead they are the demands of today. People are concerned about rising fuel costs and effects of emissions on the environment. The major contributor for the increased levels of pollutants is the Diesel engines. Diesel engine finds application in almost in all fields, including transportation sector such as buses, trucks, railway engines, etc. and in industries as power generating units. In the present work an attempt is made for effective utilization of diesel engine aiming for reduction in fuel consumption and smoke density. This is achieved by some minor modifications in diesel engine, so as to run the existing diesel engine as a LPG-Diesel dual-fuel engine with LPG (Liquefied Petroleum Gas) induction at air intake. The important aspect of LPG-Diesel dual-fuel engine is that it shows significant reduction in smoke density and improved brake thermal efficiency with reduced energy consumption. An existing 4-S, single cylinder, naturally aspirated, water-cooled, direct injection, CI engine test rig was used for the experimental purpose. With proper instrumentation the tests were conducted under various LPG flow rates, loads, and injection timings. The influence of the diesel replacement by LPG on smoke density, brake specific energy consumption and brake thermal efficiency were studied. The optimal diesel replacement pertaining to the maximum allowable LPG gas flow limits could be assessed with these experiments. The influence of the injection timing variation on the engine performance and smoke density were analyzed form the experimental results. It was also observed that beyond half load operation of the dual-fuel engine, the brake thermal efficiency increases with diesel replacement, and at full load up to 4% improvement was observed compared to full diesel operation. At full load reduction in smoke density up to 25-36% was observed compared to full diesel operation. At advance injection timing of 30Â°btdc the performance was better with lower emissions compared to normal and retarded injection timings. Copyright Â© 2003 by ASME.
Studies on influence of injection timing and Diesel replacement on LPG-Diesel dual-fuel engine
(2003) Sudhir, C.V.; Desai, V.; Suresh Kumar, Y.; Mohanan, P.
Reducing the emissions and fuel consumption for IC engines are no longer the future goals; instead they are the demands of today. People are concerned about rising fuel costs and effects of emissions on the environment. The major contributor for the increased levels of pollutants is the Diesel engines. Diesel engine finds application in almost in all fields, including transportation sector such as buses, trucks, railway engines, etc. and in industries as power generating units. In the present work an attempt is made for effective utilization of diesel engine aiming for reduction in fuel consumption and smoke density. This is achieved by some minor modifications in diesel engine, so as to run the existing diesel engine as a LPG-Diesel dual-fuel engine with LPG (Liquefied Petroleum Gas) induction at air intake. The important aspect of LPG-Diesel dual-fuel engine is that it shows significant reduction in smoke density and improved brake thermal efficiency with reduced energy consumption. An existing 4-S, single cylinder, naturally aspirated, water-cooled, direct injection, CI engine test rig was used for the experimental purpose. With proper instrumentation the tests were conducted under various LPG flow rates, loads, and injection timings. The influence of the diesel replacement by LPG on smoke density, brake specific energy consumption and brake thermal efficiency were studied. The optimal diesel replacement pertaining to the maximum allowable LPG gas flow limits could be assessed with these experiments. The influence of the injection timing variation on the engine performance and smoke density were analyzed form the experimental results. It was also observed that beyond half load operation of the dual-fuel engine, the brake thermal efficiency increases with diesel replacement, and at full load up to 4% improvement was observed compared to full diesel operation. At full load reduction in smoke density up to 25-36% was observed compared to full diesel operation. At advance injection timing of 30Â°btdc the performance was better with lower emissions compared to normal and retarded injection timings.
Combustion and emission characteristics of di compression ignition engine operated on jatropha oil methyl ester with different injection parameters
(2009) Dhananjaya, D.A.; Sudhir, C.V.; Mohanan, P.
The current paper reports the engine performance, combustion and emissions from a direct injection compression ignition engine operated with different injector opening pressure (IOP) and injection timing (IT) with jatropha oil methyl ester (JOME) (B100), B20 (20% biodiesel and 80% petroleum diesel fuel which are generally called of B20 fuel) and diesel as test fuels. The engine was run on three different IOP viz. 180, 220 and 240bar along with normal IOP 200bar and two IT viz. 20deg. bTDC and 26deg. bTDC along with normal IT 23deg. bTDC. For all IOP and IT tried, the performance parameters such as brake thermal efficiency (BTE), brake specific energy consumption (BSEC), combustion parameters such as peak cylinder pressure, peak heat release rate and ignition delay and emissions such as UBHC, smoke opacity and NOx are reported here. From the experimental investigations it is observed that IOP 220bar and IT 26deg. bTDC showed better performance for all the test fuels. On the other hand, the performance, combustion and emission characteristics of B20 blend fueled direct injection compression ignition engine performed better for entire load range of operation. At higher loads with IOP 220bar and IT 26deg. bTDC emissions such as smoke opacity and UBHC were observed to be lower compared to other IOPs and ITs. But, NOx emission at retard IT 20deg. bTDC was very low compared to other two ITs. BTE of blend B20 fueled compression ignition engine has increased by 1.01% when operated with IOP 220bar at IT 23deg. bTDC and 1.34% with IT 26deg. bTDC at IOP 200bar. On other hand blend B20 fueled direct injection compression ignition engine showed better performance with reasonable higher brake thermal efficiency and lower BSEC, better combustion and emission when compared to biodiesel (B100) and diesel fuel.

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